$NetBSD: patch-mozilla_config_stl__wrappers_ostream,v 1.1 2018/12/16 08:29:48 ryoon Exp $

--- mozilla/config/stl_wrappers/ostream.orig	2016-04-17 13:47:46.239960852 +0000
+++ mozilla/config/stl_wrappers/ostream
@@ -0,0 +1,3 @@
+#pragma GCC visibility push(default)
+#include_next <ostream>
+#pragma GCC visibility pop